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Journal of Sensors
Volume 2008 (2008), Article ID 890293, 7 pages
Research Article

An SV-GMR Needle Sensor-Based Estimation of Volume Density of Magnetic Fluid inside Human Body

1Institute of Nature and Environmental Technology (K-INET), Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
2Division of Biological Measurement and Applications, Institute of Information Sciences and Technology, Massey University, AG-HORT Building AH 3.74, Palmerston North, New Zealand

Received 18 June 2007; Accepted 25 July 2007

Academic Editor: Ignacio R. Matias

Copyright © 2008 C. P. Gooneratne et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A spin-valve giant magneto-resistive (SV-GMR) sensor of needle-type configuration is reported to estimate the volume density of magnetic fluid inside human body. The magnetic fluid is usually injected into human body to kill cancerous cell using hyperthermia-based treatment. To control the heat treatment, a good knowledge of temperature is very much essential. The SV-GMR-based needle-type sensor is used to measure the magnetic flux density of the magnetic fluid inside the human body from which the temperature is estimated. The needle-type sensor provides a semi-invasive approach of temperature determination.